#include <stdio.h>

int main() 
{
    int h = 0;//单位：cm
    int r = 0;//单位：cm
    scanf("%d %d",&h,&r);

    float V = 3.14 * h * r * r / 1000.0;
    int n = 10 / V;
    if (10/V == 0)
    {
        printf("%d",n);
    }
    else 
    {
        printf("%d",n+1);
    }
   

    return 0;
}